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G.-D. Lin, S.-L. Zhu, R. Islam, K. Kim, M.-S. Chang, S. Korenblit, C. Monroe, L.-M. Duan arXiv:0901.0579 An an-harmonic axial ion trap leads to large uniform ion chains - with translational symmetry - structurally stable Use of transverse phonon modes, eliminate the requirement of sideband cooling Simple laser pulse control leads to high-fidelity gates in any large ion crystal Complexity of quantum gate does NOT increase with the size of the system. Multiple gates can be performed in parallel at different locations of the same ion chain. Summary